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<div class="title">listener.c</div>  </div>
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<a href="listener_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/********************************************</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment">listener.c &lt;--U protocol.h</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment">listens for incoming connections and manages</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment">protocol selection and</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment">protocol-socket descriptor coupling</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> ********************************************/</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="config_8h.html">config.h</a>&quot;</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;</div>
<div class="line"><a name="l00009"></a><span class="lineno"><a class="line" href="listener_8c.html#ab5fe5302d65ffaa8f4ea4b7caa3f43dc">    9</a></span>&#160;<span class="keywordtype">int</span> <a class="code" href="listener_8c.html#ab5fe5302d65ffaa8f4ea4b7caa3f43dc">listen_for_connections</a> (uint16_t port)</div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;{</div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;  <span class="keywordtype">int</span> sd;                          <span class="comment">//socket descriptor</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;  <span class="keywordtype">int</span> nread;                       <span class="comment">//read bytes</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;  <span class="keywordtype">char</span> buffer[<a class="code" href="protocol_8h.html#a0efe825fa9e0d0776526bee6f7d830a5">PROTO_NAME_LENGTH</a>];  <span class="comment">//reading buffer</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;</div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;  <a class="code" href="protocol_8c.html#a8c3cd7cda7ec9b4be4d8176a0223244b">proto_init_library</a>();            <span class="comment">//initialize protocol library</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;  sd = <a class="code" href="tcp_8h.html#af90d1d8229d310a8db3d7f4fd5dc3533">makeserver</a>(port);           <span class="comment">//obtain socket descriptor - forks process!</span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;  <a class="code" href="protocol_8h.html#a53a45e5bfa8921af754097ee6a02f642">proto_module_t</a> module;           <span class="comment">//module implementing protocol</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;  printf(<span class="stringliteral">&quot;Request is being served by PID %d\n&quot;</span>, getpid());</div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;  <a class="code" href="protocol_8c.html#ac851c29c26c03f25155d82adaada4014">proto_get_protocol_code</a>(sd, buffer);</div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;</div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;  <span class="comment">//the first PROTO_NAME_LENGTH bytes contain the desired protocol</span></div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;  module = <a class="code" href="protocol_8c.html#ab25c6487e37049b4495c8ce9737c2eba">proto_lookup</a>(buffer);</div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;  <span class="keywordflow">if</span> (module == NULL)</div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;    {</div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;      <a class="code" href="protocol_8c.html#ab317a4b5fae174c50e993b8498c682e5">proto_goodbye_failure</a>(sd, <a class="code" href="protocol_8h.html#aef113f145ad544ae7347e10a6ca317eb">PROTOCOL_ERROR</a>);</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;    }</div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;  <span class="keywordflow">if</span> (module(sd) &lt; 0) {</div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;    perror(<span class="stringliteral">&quot;listener.c:listen_for_connections:module&quot;</span>);</div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;    <a class="code" href="protocol_8c.html#ab317a4b5fae174c50e993b8498c682e5">proto_goodbye_failure</a>(sd, <a class="code" href="protocol_8h.html#acb00992efca56626cdf0907e5edb5b51">KO</a>);</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;    exit(EXIT_FAILURE);</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;  }</div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;  exit(EXIT_SUCCESS);</div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;}</div>
<div class="ttc" id="protocol_8c_html_a8c3cd7cda7ec9b4be4d8176a0223244b"><div class="ttname"><a href="protocol_8c.html#a8c3cd7cda7ec9b4be4d8176a0223244b">proto_init_library</a></div><div class="ttdeci">void proto_init_library()</div><div class="ttdef"><b>Definition:</b> <a href="protocol_8c_source.html#l00011">protocol.c:11</a></div></div>
<div class="ttc" id="protocol_8c_html_ab317a4b5fae174c50e993b8498c682e5"><div class="ttname"><a href="protocol_8c.html#ab317a4b5fae174c50e993b8498c682e5">proto_goodbye_failure</a></div><div class="ttdeci">void proto_goodbye_failure(int socket_descriptor, const char *command)</div><div class="ttdef"><b>Definition:</b> <a href="protocol_8c_source.html#l00139">protocol.c:139</a></div></div>
<div class="ttc" id="protocol_8c_html_ab25c6487e37049b4495c8ce9737c2eba"><div class="ttname"><a href="protocol_8c.html#ab25c6487e37049b4495c8ce9737c2eba">proto_lookup</a></div><div class="ttdeci">proto_module_t proto_lookup(const char *proto_name)</div><div class="ttdef"><b>Definition:</b> <a href="protocol_8c_source.html#l00060">protocol.c:60</a></div></div>
<div class="ttc" id="protocol_8h_html_a53a45e5bfa8921af754097ee6a02f642"><div class="ttname"><a href="protocol_8h.html#a53a45e5bfa8921af754097ee6a02f642">proto_module_t</a></div><div class="ttdeci">int(* proto_module_t)(int socket_descriptor)</div><div class="ttdef"><b>Definition:</b> <a href="protocol_8h_source.html#l00026">protocol.h:26</a></div></div>
<div class="ttc" id="config_8h_html"><div class="ttname"><a href="config_8h.html">config.h</a></div></div>
<div class="ttc" id="protocol_8h_html_aef113f145ad544ae7347e10a6ca317eb"><div class="ttname"><a href="protocol_8h.html#aef113f145ad544ae7347e10a6ca317eb">PROTOCOL_ERROR</a></div><div class="ttdeci">#define PROTOCOL_ERROR</div><div class="ttdef"><b>Definition:</b> <a href="protocol_8h_source.html#l00103">protocol.h:103</a></div></div>
<div class="ttc" id="tcp_8h_html_af90d1d8229d310a8db3d7f4fd5dc3533"><div class="ttname"><a href="tcp_8h.html#af90d1d8229d310a8db3d7f4fd5dc3533">makeserver</a></div><div class="ttdeci">int makeserver(uint16_t port)</div><div class="ttdef"><b>Definition:</b> <a href="tcpserver_8c_source.html#l00017">tcpserver.c:17</a></div></div>
<div class="ttc" id="protocol_8h_html_a0efe825fa9e0d0776526bee6f7d830a5"><div class="ttname"><a href="protocol_8h.html#a0efe825fa9e0d0776526bee6f7d830a5">PROTO_NAME_LENGTH</a></div><div class="ttdeci">#define PROTO_NAME_LENGTH</div><div class="ttdef"><b>Definition:</b> <a href="protocol_8h_source.html#l00021">protocol.h:21</a></div></div>
<div class="ttc" id="listener_8c_html_ab5fe5302d65ffaa8f4ea4b7caa3f43dc"><div class="ttname"><a href="listener_8c.html#ab5fe5302d65ffaa8f4ea4b7caa3f43dc">listen_for_connections</a></div><div class="ttdeci">int listen_for_connections(uint16_t port)</div><div class="ttdef"><b>Definition:</b> <a href="listener_8c_source.html#l00009">listener.c:9</a></div></div>
<div class="ttc" id="protocol_8c_html_ac851c29c26c03f25155d82adaada4014"><div class="ttname"><a href="protocol_8c.html#ac851c29c26c03f25155d82adaada4014">proto_get_protocol_code</a></div><div class="ttdeci">void proto_get_protocol_code(int socket_descriptor, char *proto_name)</div><div class="ttdef"><b>Definition:</b> <a href="protocol_8c_source.html#l00027">protocol.c:27</a></div></div>
<div class="ttc" id="protocol_8h_html_acb00992efca56626cdf0907e5edb5b51"><div class="ttname"><a href="protocol_8h.html#acb00992efca56626cdf0907e5edb5b51">KO</a></div><div class="ttdeci">#define KO</div><div class="ttdef"><b>Definition:</b> <a href="protocol_8h_source.html#l00102">protocol.h:102</a></div></div>
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